Apparatus

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sensors Mode-S transponder

A2941C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2651S · CESSNA 402 Businessliner · operated by HYANNIS AIR SERVICE INC

Hex
A2941C
Octal
50512034
Decimal
10,654,748
Country
US
Tail
N2651S
Type
C402
No current signal · last broadcast 6h ago
Flights observed
241
Distinct callsigns
20
Country
US
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S A2941C.

Country allocation

The ICAO 24-bit address A2941C falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
KAP616 Cape Air 22 2026-06-12
KAP3064 Cape Air 21 2026-05-28
KAP519 - 19 2026-06-23
KAP811 - 17 2026-06-25
KAP548 - 16 2026-07-13
KAP635 - 13 2026-06-29
KAP1838 Cape Air 12 2026-05-29
KAP42 Cape Air 10 2026-06-02
KAP527 Cape Air 8 2026-04-25
KAP212 Cape Air 7 2026-05-29
KAP10 Cape Air 7 2026-05-31
KAP214 Cape Air 6 2026-05-28
KAP210 Cape Air 6 2026-05-28
KAP109 - 6 2026-06-17
KAP920 Cape Air 5 2026-05-15
KAP6789 Cape Air 5 2026-04-26
KAPT627 - 4 2026-06-07
KAP78 - 3 2026-07-04
KAP7 - 3 2026-06-15
KAP5573 Cape Air 3 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 KAP548 - Jul 13, 20:50 UTCJul 13, 22:05 UTC1h 15m
2026-07-13 KAP548 - Jul 13, 18:30 UTCJul 13, 19:40 UTC1h 10m
2026-07-13 KAP548 - Jul 13, 13:10 UTCJul 13, 14:30 UTC1h 20m
2026-07-13 KAP548 - Jul 13, 11:10 UTCJul 13, 12:20 UTC1h 10m
2026-07-12 KAP548 - Jul 12, 20:35 UTCJul 12, 21:45 UTC1h 10m
2026-07-12 KAP548 - Jul 12, 18:45 UTCJul 12, 19:50 UTC1h 5m
2026-07-12 KAP548 - Jul 12, 13:05 UTCJul 12, 14:10 UTC1h 5m
2026-07-12 KAP548 - Jul 12, 11:20 UTCJul 12, 12:20 UTC1h 0m
2026-07-11 KAP548 - Jul 11, 21:25 UTCJul 11, 22:30 UTC1h 5m
2026-07-11 KAP548 - Jul 11, 19:25 UTCJul 11, 20:35 UTC1h 10m
2026-07-11 KAP548 - Jul 11, 13:00 UTCJul 11, 14:05 UTC1h 5m
2026-07-11 KAP548 - Jul 11, 11:05 UTCJul 11, 12:15 UTC1h 10m
2026-07-10 KAP548 - Jul 10, 20:35 UTCJul 10, 21:35 UTC1h 0m
2026-07-10 KAP548 - Jul 10, 18:40 UTCJul 10, 19:45 UTC1h 5m
2026-07-10 KAP548 - Jul 10, 13:40 UTCJul 10, 14:45 UTC1h 5m
2026-07-10 KAP548 - Jul 10, 11:20 UTCJul 10, 12:30 UTC1h 10m
2026-07-05 KAP350 - Jul 5, 23:40 UTCJul 6, 00:35 UTC55m
2026-07-05 KAP350 - Jul 5, 22:15 UTCJul 5, 22:50 UTC35m
2026-07-05 KAP350 - Jul 5, 19:50 UTCJul 5, 20:20 UTC30m
2026-07-05 KAP627 - Jul 5, 17:45 UTCJul 5, 18:15 UTC30m
2026-07-05 KAP627 SLK → BOS Jul 5, 16:20 UTCJul 5, 16:30 UTC10m
2026-07-04 KAP78 BOS → HYA Jul 4, 01:20 UTCJul 4, 02:15 UTC55m
2026-07-03 KAP78 - Jul 3, 23:40 UTCJul 4, 00:10 UTC30m
2026-07-03 KAP78 - Jul 3, 20:30 UTCJul 3, 21:50 UTC1h 20m
2026-07-02 KAP296 BOS → HYA Jul 2, 17:50 UTCJul 2, 18:05 UTC15m
2026-07-02 KAP296 BOS → HYA Jul 2, 16:15 UTCJul 2, 16:45 UTC30m
2026-07-02 KAP5302 - Jul 2, 14:35 UTCJul 2, 15:10 UTC35m
2026-07-02 KAP296 BOS → HYA Jul 2, 12:55 UTCJul 2, 13:25 UTC30m
2026-07-02 KAP5002 ACK → BOS Jul 2, 11:20 UTCJul 2, 12:05 UTC45m
2026-06-29 KAP635 - Jun 29, 02:09 UTCJun 29, 02:25 UTC15m
2026-06-29 KAP635 - Jun 29, 00:54 UTCJun 29, 01:29 UTC35m
2026-06-28 KAP6747 - Jun 28, 23:44 UTCJun 29, 00:14 UTC30m
2026-06-28 KAP635 - Jun 28, 22:04 UTCJun 28, 22:34 UTC30m
2026-06-28 KAP5322 ACK → BOS Jun 28, 18:19 UTCJun 28, 18:55 UTC35m
2026-06-28 KAP635 - Jun 28, 00:04 UTCJun 28, 01:04 UTC1h 0m
2026-06-27 KAP635 - Jun 27, 22:45 UTCJun 27, 23:25 UTC40m
2026-06-27 KAP6186 - Jun 27, 21:44 UTCJun 27, 22:09 UTC25m
2026-06-27 KAP635 - Jun 27, 19:05 UTCJun 27, 20:39 UTC1h 35m
2026-06-27 KAP635 - Jun 27, 18:09 UTCJun 27, 18:24 UTC15m
2026-06-26 KAP155 - Jun 26, 21:59 UTCJun 26, 23:09 UTC1h 10m
2026-06-26 KAP3181 MVY → BOS Jun 26, 20:20 UTCJun 26, 20:55 UTC35m
2026-06-26 KAP155 - Jun 26, 18:09 UTCJun 26, 18:34 UTC25m
2026-06-26 KAP7121 - Jun 26, 17:04 UTCJun 26, 17:44 UTC40m
2026-06-25 KAP811 - Jun 25, 22:14 UTCJun 25, 23:24 UTC1h 10m
2026-06-23 KAP519 - Jun 23, 23:55 UTCJun 24, 00:09 UTC15m
2026-06-18 KAP186 STT → SJU Jun 18, 14:35 UTCJun 18, 15:30 UTC55m
2026-06-18 KAP412 MVY → BOS Jun 18, 11:10 UTCJun 18, 11:40 UTC30m
2026-06-18 KAP519 BOS → ALB Jun 18, 01:25 UTCJun 18, 02:25 UTC1h 0m
2026-06-17 KAP519 BOS → ALB Jun 17, 23:50 UTCJun 18, 00:55 UTC1h 5m
2026-06-17 KAP519 BOS → ALB Jun 17, 21:45 UTCJun 17, 23:00 UTC1h 15m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N2651S page for operator, model, and routing details .

Mode-S A2941C frequently asked

What is Mode-S code A2941C?
A2941C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2651S.
Where is Mode-S A2941C registered?
Mode-S code A2941C is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A2941C broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2941C, octal 50512034, decimal 10,654,748.
What flights does A2941C operate?
Mode-S A2941C has broadcast 20 distinct callsigns, including KAP616, KAP3064, KAP519, KAP811, KAP548.